Why can't my Galaxy S5 send sms?

[clnheart]

Galaxy s5 can't send sms

I have tried resetting permissions, I attempted to change APN settings but they are greyed out so I can't mess with them. I can send mms only. I have no problem receiving sms and mms... any ideas?

 

[B. Diddy]

Re: Galaxy s5 can't send sms

Welcome to Android Central! Have you asked your carrier about this?